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REP: Difference between revisions
From SnesLab
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'''REP''' (Reset Status Bits) is a [[65c816]] instruction that clears bits in the [[status register]] that correspond to set bits in the operand. | '''REP''' (Reset Status Bits) is a [[65c816]] instruction that clears bits in the [[status register]] that correspond to set bits in the operand. | ||
REP appears to be the only way to clear the m and x flags other than [[PLP]]. | REP appears to be the only way to clear the m and x flags other than [[PLP]] and [[RTI]]. | ||
=== See Also === | === See Also === | ||
Latest revision as of 16:52, 14 December 2023
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Immediate | C2 | 2 bytes | 3 cycles | ||||
| Flags Affected | ||||||||
|---|---|---|---|---|---|---|---|---|
| N | V | M | X | D | I | Z | C | |
| emulation mode | . | . | ||||||
| native mode | ||||||||
REP (Reset Status Bits) is a 65c816 instruction that clears bits in the status register that correspond to set bits in the operand.
REP appears to be the only way to clear the m and x flags other than PLP and RTI.
See Also
External Links
- Eyes & Lichty page 489, on REP: https://archive.org/details/0893037893ProgrammingThe65816/page/n515
- Labiak page 173 on REP: https://archive.org/details/Programming_the_65816/page/n183
- snes9x implementation of REP: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L3145
- undisbeliever on REP: https://undisbeliever.net/snesdev/65816-opcodes.html#rep-reset-status-bits